function search(nums: number[], target: number): number{
    let left = 0;
    let right = nums.length - 1;
    while(left <= right){
        let mid = left + Math.floor((right - left)/2);
        if(nums[mid] > target){
            right = mid - 1;
        }
        else if(nums[mid] < target){
            left = mid + 1;
        }
        else{
            return mid;
        }
    }
    return -1;
};

// return nums.indexOf(target)  蚌埠住了